NDLI: Anisotropy of the thermoelectric figure of merit (ZT) in textured Ca3Co4O9 ceramics prepared by using a spark plasma sintering process

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Anisotropy of the thermoelectric figure of merit (ZT) in textured Ca3Co4O9 ceramics prepared by using a spark plasma sintering process

Content Provider	Semantic Scholar
Author	Lim, Chang-Hyun Seo, Won-Seon Lee, Soonil Lim, Young Soo Kim, Jong-Young Park, Hyung-Ho Choi, Soon-Mok Lee, Kyu Hyoung Park, Kyeongsoon
Copyright Year	2015
Abstract	Textured Ca3Co4O9 ceramics were prepared by spark plasma sintering (SPS) from commercial CaCO3 and Co3O4 powders to investigate the thermoelectric anisotropy of Ca3Co4O9. The degree of orientation of the textured specimens was evaluated by using the Lotgering factor method, and the SPS process was confirmed to be an effective technology to prepare textured Ca3Co4O9 ceramics. Both the power factors and the thermal conductivities were measured in two different directions, parallel (out-of-plane) and perpendicular (in-plane) to the SPS press axis. The difference in anisotropy between the electrical conductivity and the thermal conductivity was investigated for the textured Ca3Co4O9 ceramics. The maximum figure of merit (ZT) value along the direction perpendicular to the SPS press axis was more than 20% higher than it was along the direction parallel to the SPS press axis. It is noted that the strong thermoelectric anisotropy can give rise to an overestimates of ZT when preparing samples in different directions for power factor and thermal conductivity measurements.
Starting Page	794
Ending Page	799
Page Count	6
File Format	PDF HTM / HTML
DOI	10.3938/jkps.66.794
Volume Number	66
Alternate Webpage(s)	https://page-one.springer.com/pdf/preview/10.3938/jkps.66.794
Alternate Webpage(s)	https://doi.org/10.3938/jkps.66.794
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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